##### Study Set Content:
1- Flashcard

“resistance” of a fluid which is being deformed by either shear stress or tensile stress.

Viscosity

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2- Flashcard

Viscosity other word

- "thickness" or "internal friction“

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3- Flashcard

The study of flowing matter is known which includes viscosity and related concepts.

Rheology

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4- Flashcard

used to measure viscosity

Ostwald viscometer

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5- Flashcard

is the ratio of the absolute viscosity of the fluid on the viscosity of water at a certain temperature

Relative Viscosity

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6- Flashcard

is force (dyne) necessary to move the layer of liquid 1 cm2 in speed 1 cm/sec on another layer of liquid and the distance between them is 1cm.

Viscosity coefficient

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7- Flashcard

Viscosity coefficients cam be defined in two way

 Dynamic viscosity

Kinematic viscosity

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8- Flashcard

(absolute viscosity)

Dynamic viscosity

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9- Flashcard

the more usual one (typical units Pa•s, Poise, P);

Dynamic viscosity

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10- Flashcard

is the dynamic viscosity divided by the density (typical units m2/s, Stokes, St).

Kinematic viscosity

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11- Flashcard

Factors effect on the viscosity:

 Temperature  Molecular weights  Pressure

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12- Flashcard

used for those fluids which cannot be defined by a single value of viscosity.

Rheometer

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13- Flashcard

a device used to measure the viscosity of the liquid with a known density.

Ostwald viscometer

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14- Flashcard

Ostwald viscometer other names

r (Wilhelm Ostwald) (Utube Viscometer, Capillary Viscometer)

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15- Flashcard

Measuring the time for a known volume of the liquid (the volume contained between the marks A and B) to flow through the capillary under the influence of gravity.

Ostwald viscometer

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16- Flashcard

- close temperature control of the fluid

Rheometer -used for those

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17- Flashcard

The instrument must first be calibrated with materials of known viscosity such as

pure (deionized) water.

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18- Flashcard

Knowing the value of viscosity of one liquid, one can calculate the viscosity of

other liquid.

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19- Flashcard

Where η1 and η2 are viscosity coefficients of the liquid and water, and ρ1 and ρ2 are the densities of liquid and water, respectively

you can calculate the viscosity of the other liquid

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20- Flashcard

Enumerate the different pharmaceutical dosage forms which viscosity is part of the minimum test requirement.

Suspensions

 Emulsions

 Creams

 Ointments (External Lotion)

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